Centrifugal screen.



H. PARKER.

GENTRIFUGAL SCREEN.

APPLICATION FILED 110v. 15, 1911.

Patented Aug. 20, 1912.

2 SHEETS-SHEET 1.

Howard Parker.

mvsr rrore H. PARKER.

GENTRIFUGAL SCREEN APPLICATION FILED NOV. 15. 1911.

g gggg gw Pawnted Aug. 2Q, 1912.

wgTNEssEs i Q LL IINVENTOR Howard Parker,

HOWARD PARKER, F NASHUA, NEW HAMPSHIRE.

CENTRIFUGAL SCREEN.

Specification of Letters lfatent.

' Patented Aug. 2o, 11.932.

Appiication filed November 15, 1911. Serial No. 660,446.

To allwh'om it may concern Be it known that I, HOWARD PARKER, a citizenof the United States, and a resident of Nashua, in the county ofHillsboro and 5 State of New Hampshire, have invented certain new anduseful Improvements in Centrifugal Screens, of which the following is aspecification.

This invention relates particularly to hori- Zontally arrangedcentrifugal screens such as are nsed in the screening of pulp stock, andthe invention relates in particular to what may be termed a distributerutilized for distributing the unscreened stocl within the machine at apoint where it is taken up by the blades of a rotary impeller. Inconnection with the distributer a device is provided to prevent the cloging of the feed outlets by chips and knots.

The invention, will be more particularly described in connection withthe drawings in which Figure l is a central vertical section of a screenin which my invention is embodied. ;]5ig. 2 is a detail view on enlargedscale in central section of in end of a feed spout and a distributer.Fig. 3 is an end view of the feed spout with the distributer rt .noved.

' Fig. 4 is a View of the inner end )f we distributer. v

Referring to the drawings a is the screen casing, 7) the screen cylinderwhich may or may not be rotatable, c c the feed spouts projecting intothe interior of the screen drum at each end thereof, the inner ends ofthese feed spouts being squared off as indicated at c (1. These feedspouts are of horse-shoeshape as indicated in Fig. 3 andut the inner endof the spouts a filler plate c extends be- 40 tween the edges for thepurpose which will be hereinafter stated.

(Z is the hub of the impeller mounted on the shaft 10 and having theblades (4" n" which rotate in the space between the screen drum and thefeed spouts and by means of which the stock is forcibly thrown againstthe screen.

c c are the distributors rotatably mounted on the shaft 10. 'lhcsodistributers each 0 comprise a hub :20 and a circumferential channel 21which against the open inner ends of the feed spouts c c. the rear wallof the channel being apert-urcd as at .22 forming stock outlets. Theui'iscreened stock enteringthe machine through the feed spouts passesinto this rota tin g' dist ributcr and -tion with a parti annularessential part of which is the channel, can

be carried directly by the impeller hub or blades if desired, ratherthan formed as a separate structure separately mounted on the 7 shaft.By its use the stock is given a whirling or rotary motion before it goesto the impeller blades and increases the etiiciency of the machineparticularly in respect of v the amount of power used to operate it.

To avoid clogging of the outlets by knots or slivers-and other largepieces of ina-' terial, I attach to the feed outlets knives 30 whichproject into the channel 21 of the distributors with their cutting edgesopposed to the direction of rotation of the dis tributers, with theresult that any knotsor slivers or large pieces of material are cut andground so that they will readily pass out of the pulp outlets. Bypreference I use and have illustrated a U-shaped knife which correspondsrather closely to the cross sectional shape of the channels in thedistributers.

I claim as my invention: I

1. In a centrifugal screen, the combination with a parti annularstationary feed spout, of a rotary distributer arranged in operativerelationto said spout and provided with stock outlets.

2. In a centrifugal screei, the combinationwith a parti annular openended feed spout, of a rotary distributer mounted op-' posite to and .inoperative relation with the open end of said spout and provided withstock outlets.

3. In a centrifugal screen, the combinatationary open ended feed spoutof a role y distributor having a circumferi .i'tial channel locatedopposite to the open end of said s gout.

4. In a centrifugal screen, the combina tion with a stationary openended feed spout, of a rotary distributorprovided with a circumferentialchannel located opposite to and in operative relation with the open endof said spout, the rear, wall of said channel beiuo' apcrturcd.

5. In a centrifugal screen, the combination with a feed spout, and adistributer arranged in operative relation thereto and adapted toreceive stock delivered by the spout, of a eutter secured to said spoutand projecting into said distributer.

6. In a centrifugal screen, the combination with a casing, a screendrum, a stationary feed spout and an impeller provided with bladesmounted for rotation in the space between the spout. and feed drum of arotary distributer provided with a recessed face arranged in operativerelation with said spout and stock outlets in the rear wall of saidrecess.

. 7. In a centrifugal screen, a casing, a screen drum, a stationary feedspout, an impeller provided with blades, and a rotary distributerinterposed between said feed spent and said impeller and adapted toreceive the stock from said feed spout and deliver it to said impeller.

HOWARD PARKER. \Vitnesses:

Mania); 1*. MANEY, ROBERT A. FRENCH.

